http://www.online-literature.com/melville/confidence-man/14/
HERMAN MELVILLE - THE CONFIDENCE MAN
If reason be judge, no writer has produced such inconsistent characters as nature herself has. It must call for no small sagacity in a reader unerringly to discriminate in a novel between the inconsistencies of conception and those of life as elsewhere. Experience is the only guide here; but as no one man can be coextensive with
what is, it may be unwise in every ease to rest upon it. When the duck-billed beaver of Australia was first brought stuffed to England, the naturalists, appealing to their classifications, maintained that there was, in reality, no such creature; the bill in the specimen must needs be, in some way, artificially stuck on.
Is "ease" used as a metonymy of "moment of ease"?